class_docstr: Shuffling implements a shuffling algorithm. Items can be added to the shuffling buffer and removed in a
  different order as defined by the concrete shuffling algorithm. A shuffling buffer is intended to be used from
  a single thread, hence, not thread safe.
docstr: Selects an item from the buffer and returns the item to the caller. The item is removed from the buffer.
  
  :return: The selected item.
docstr_tok: ["Selects","an","item","from","the","buffer","and","returns","the","item","to","the","caller",".","The","item","is","removed","from","the","buffer",".",":","return",":","The","selected","item","."]
code: def retrieve(self):
      """Selects an item from the buffer and returns the item to the caller. The item is removed from the buffer.
  
      :return: The selected item.
      """
  
imports: import abc
  from collections import deque
  import numpy
  import six
label_desc: Use image node_id 2 for calling the ShufflingBufferBase obj's underlying member method code with example usage: obj.retrieve() without return types